Rashi on Genesis 35:2/רש"י על בראשית ל״ה:ב׳

1הנכר [PUT AWAY] THE STRANGE [GODS] —which you have in your possession from the spoil of Shechem.

2ותטהרו AND PURIFY YOURSELVES of idol-worship.

3והחליפו שמלותיכם AND CHANGE YOUR GARMENTS — lest you have in your possession a vestment that has been employed in idolatrous worship (Genesis Rabbah 81:3).